When to plant Broccolini in Tropical Australia
Tropical zone — applies to Darwin, Cairns, Townsville, Broome, Mackay and similar areas. Growing elsewhere? Temperate · Cool · Subtropical · Arid.
Raise broccolini seedlings and transplant from April to June, sowing 5 mm deep as the dry season begins. In the tropics this narrow autumn-into-dry window is the only reliable time, giving Townsville and Cairns growers the cooler nights this brassica needs. Seed germinates in 5 to 10 days, and plants reach cutting size in 60 to 90 days, comfortably inside the dry. Space transplants 30 to 40 cm apart with 40 to 50 cm between rows for good airflow. Plant into rich, free-draining soil in full sun and keep moisture steady for tender, sweet stems.
Sowing calendar — tropical zone
Green months are your sowing window: April to June.
Growing notes
Broccolini is a slender sprouting broccoli that keeps producing side shoots after the first cut, so a single planting can crop for weeks if the season holds. In the tropics that means getting it in early in the dry and cutting hard before the heat returns.
The main pest is cabbage moth, whose green caterpillars burrow into the growing tips and leave frass and holes. Drape fine exclusion netting over the bed from transplanting and keep it sealed. It is far more effective than chasing caterpillars by hand or spraying, and it also keeps cabbage white butterfly off.
Feed well: dig compost through the bed and side-dress with a nitrogen-rich fertiliser two weeks after planting to drive leafy growth. The common tropical failure is bolting, where warm nights and any moisture stress send plants straight to flower before the stems fatten. Keep watering consistent and never let seedlings check. In Darwin and Mackay, harvest the central spear early to trigger side shoots, then keep cutting every few days. Pull the crop before September rather than pushing it into the building humidity, which invites downy mildew on tired plants.
Broccolini at a glance
| Sowing depth | 5 mm |
|---|---|
| Plant spacing | 30-40 cm |
| Row spacing | 40-50 cm |
| Germination | 5-10 days |
| Days to maturity | 60-90 days |
| Frost tolerance | Hardy |
| Method | Plant Seedlings |
Common questions
- what is the best time to plant broccolini in Townsville?
- Transplant from April to June, right at the start of the dry season. Cooler nights let plants mature in 60 to 90 days and produce side shoots before the wet returns.
- how do I keep caterpillars off broccolini?
- Use fine exclusion netting over the bed from the day you transplant, sealed at the edges. This stops cabbage moth and cabbage white butterfly laying on the plants.
- does broccolini keep producing after the first harvest?
- Yes. Cut the central spear early and the plant pushes out side shoots for several weeks. Harvest every few days to keep new shoots coming before heat ends the season.
- why is my broccolini bolting to flower?
- Warm nights and moisture stress cause bolting. Sow only in the dry season, keep watering consistent, and avoid letting seedlings dry out or check at transplanting.
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